Package com.blazebit.persistence.impl.function.window

Class AbstractWindowFunction

java.lang.Object

com.blazebit.persistence.impl.function.window.AbstractWindowFunction

All Implemented Interfaces:

JpqlFunction

Direct Known Subclasses:

AbstractGroupConcatWindowFunction, AvgFunction, CountFunction, CumeDistFunction, DenseRankFunction, FirstValueFunction, LagFunction, LastValueFunction, LeadFunction, MaxFunction, MinFunction, ModeFunction, NthValueFunction, NtileFunction, PercentileContFunction, PercentileDiscFunction, PercentRankFunction, RankFunction, RowNumberFunction, SumFunction, WindowEveryFunction, WindowOrAggFunction

public abstract class AbstractWindowFunction
extends Object
implements JpqlFunction

See the following for details: https://www.postgresql.org/docs/current/sql-expressions.html#SYNTAX-WINDOW-FUNCTIONS

Since:

1.4.0

Author:

Jan-Willem Gmelig Meyling, Sayra Ranjha

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
protected static class	AbstractWindowFunction.WindowFunction

Field Summary

Fields

Modifier and Type	Field	Description
protected final boolean	allowsFilterClause
protected final String	functionName
protected final boolean	nullIsSmallest
protected final boolean	supportsFilterClause
protected final boolean	supportsNullPrecedence

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractWindowFunction(String functionName, boolean nullIsSmallest, boolean supportsNullPrecedence, boolean supportsFilterClause, boolean allowsFilterClause)

Method Summary

Modifier and Type	Method	Description
protected void	appendEmulatedOrderByElementWithNulls(FunctionRenderContext context, Order element)
protected static String	getCaseWhenPost()
protected static String	getCaseWhenPre(List<String> filterExpressions)
Class<?>	getReturnType(Class<?> firstArgumentType)
protected AbstractWindowFunction.WindowFunction	getWindowFunction(FunctionRenderContext context)
protected <T extends AbstractWindowFunction.WindowFunction> T	getWindowFunction(FunctionRenderContext context, T function, int startIndex)
boolean	hasArguments()
boolean	hasParenthesesIfNoArguments()
protected boolean	optimizeNullPrecedence()
protected Enum<?>	processArgument(Enum<?> mode, AbstractWindowFunction.WindowFunction windowFunction, String argument)
final void	render(FunctionRenderContext context)
protected void	render(FunctionRenderContext context, AbstractWindowFunction.WindowFunction windowFunction)
protected void	renderArgument(FunctionRenderContext context, AbstractWindowFunction.WindowFunction windowFunction, String caseWhenPre, String caseWhenPost, String argument, int argumentIndex)
protected void	renderArguments(FunctionRenderContext context, AbstractWindowFunction.WindowFunction windowFunction)
protected void	renderFilterExpressions(FunctionRenderContext context, List<String> filterExpressions)
protected void	renderFrame(FunctionRenderContext context, AbstractWindowFunction.WindowFunction windowFunction)
protected void	renderFramePosition(FunctionRenderContext context, WindowFramePositionType type, String frameExpression)
protected void	renderFunction(FunctionRenderContext context, AbstractWindowFunction.WindowFunction windowFunction)
protected void	renderOrder(FunctionRenderContext context, Order order)
protected void	renderOrderBy(FunctionRenderContext context, List<Order> orderBys)
protected void	renderPartitions(FunctionRenderContext context, List<String> partitionExpressions)
protected void	renderWithinGroup(FunctionRenderContext context, List<Order> withinGroup)
protected boolean	requiresOver()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

functionName

protected final String functionName

nullIsSmallest

protected final boolean nullIsSmallest

supportsNullPrecedence

protected final boolean supportsNullPrecedence

supportsFilterClause

protected final boolean supportsFilterClause

allowsFilterClause

protected final boolean allowsFilterClause

Constructor Details

AbstractWindowFunction

protected AbstractWindowFunction(String functionName,
 boolean nullIsSmallest,
 boolean supportsNullPrecedence,
 boolean supportsFilterClause,
 boolean allowsFilterClause)

Method Details

hasArguments

public boolean hasArguments()

Specified by:

hasArguments in interface JpqlFunction

hasParenthesesIfNoArguments

public boolean hasParenthesesIfNoArguments()

Specified by:

hasParenthesesIfNoArguments in interface JpqlFunction

getReturnType

public Class<?> getReturnType(Class<?> firstArgumentType)

Specified by:

getReturnType in interface JpqlFunction

render

public final void render(FunctionRenderContext context)

Specified by:

render in interface JpqlFunction

getWindowFunction

protected AbstractWindowFunction.WindowFunction getWindowFunction(FunctionRenderContext context)

getWindowFunction

protected <T extends AbstractWindowFunction.WindowFunction>
T getWindowFunction(FunctionRenderContext context,
 T function,
 int startIndex)

processArgument

protected Enum<?> processArgument(Enum<?> mode,
 AbstractWindowFunction.WindowFunction windowFunction,
 String argument)

requiresOver

protected boolean requiresOver()

render

protected void render(FunctionRenderContext context,
 AbstractWindowFunction.WindowFunction windowFunction)

renderFunction

protected void renderFunction(FunctionRenderContext context,
 AbstractWindowFunction.WindowFunction windowFunction)

renderArguments

protected void renderArguments(FunctionRenderContext context,
 AbstractWindowFunction.WindowFunction windowFunction)

getCaseWhenPre

protected static String getCaseWhenPre(List<String> filterExpressions)

getCaseWhenPost

protected static String getCaseWhenPost()

renderArgument

protected void renderArgument(FunctionRenderContext context,
 AbstractWindowFunction.WindowFunction windowFunction,
 String caseWhenPre,
 String caseWhenPost,
 String argument,
 int argumentIndex)

renderWithinGroup

protected void renderWithinGroup(FunctionRenderContext context,
 List<Order> withinGroup)

renderFilterExpressions

protected void renderFilterExpressions(FunctionRenderContext context,
 List<String> filterExpressions)

renderPartitions

protected void renderPartitions(FunctionRenderContext context,
 List<String> partitionExpressions)

renderOrderBy

protected void renderOrderBy(FunctionRenderContext context,
 List<Order> orderBys)

renderOrder

protected void renderOrder(FunctionRenderContext context,
 Order order)

renderFrame

protected void renderFrame(FunctionRenderContext context,
 AbstractWindowFunction.WindowFunction windowFunction)

renderFramePosition

protected void renderFramePosition(FunctionRenderContext context,
 WindowFramePositionType type,
 String frameExpression)

optimizeNullPrecedence

protected boolean optimizeNullPrecedence()

appendEmulatedOrderByElementWithNulls

protected void appendEmulatedOrderByElementWithNulls(FunctionRenderContext context,
 Order element)